Benchmark: Object.is vs ===

Tests:

Object.is
Object.is(1, 1);
a === b
1 === 1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.is
a === b

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser/OS: Chrome 141 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Object.is	256181008.0 Ops/sec
a === b	268097056.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**What is being tested?**

The provided JSON represents a microbenchmark on measuring the performance difference between two operators in JavaScript: `Object.is` and `===`. These operators are used to compare values for equality.

**Options compared:**

There are two options being compared:

1. **`Object.is(1, 1)`**: This operator checks if the two operands have the same value using a primitive value comparison. It returns `true` if both operands are of the same type (e.g., both numbers) and have the same numeric value.
2. **`a === b`** (where `a` and `b` are variables): This operator checks for strict equality between two values, taking into account their types and data structures.

**Pros and Cons:**

1. **`Object.is()`**:
	* Pros:
		+ More efficient than `===` when comparing primitive values.
		+ Can be more readable in some cases, as it explicitly states the intent of checking for equality between two values.
	* Cons:
		+ May not be supported by all browsers or JavaScript engines.
		+ Can lead to unexpected behavior if used with non-numeric values (e.g., comparing a string with another value).
2. **`===`**:
	* Pros:
		+ Widely supported across different browsers and JavaScript engines.
		+ Works correctly with any type of variable, including objects, arrays, and other data structures.
	* Cons:
		+ May be slower than `Object.is()` when comparing primitive values.
		+ Can lead to unexpected behavior if used incorrectly (e.g., trying to compare a non-numeric value with another value).

**Library usage:**

There is no explicit library mentioned in the provided JSON. However, it's worth noting that some JavaScript implementations may use internal libraries or optimized functions for equality comparisons.

**Special JS features/syntax:**

No special JavaScript features or syntax are used in this benchmark. The test cases only involve basic comparison operators (`Object.is()` and `===`).

**Other alternatives:**

If you wanted to create a similar benchmark, you could consider using other comparison operators, such as:

* **`==`**: Loose equality operator (less common and potentially slower than `===`)
* **`instanceof`**: Checks if an object is of a specific constructor type
* **`getOwnPropertyDescriptor()`** or **`Object.keys()`**: Can be used to compare the properties of two objects

Keep in mind that these alternatives may not provide the same level of performance or readability as `Object.is()` and `===`.

Related benchmarks:

Object.is vs === (version: 0)

Comparing performance of: Object.is vs a === b

Created: 2 years ago by: Guest

Jump to the latest result

Object.is

a === b

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):